[johanmorris]

And I think I found the solution!!!
Apparently, after an upgrade, NewsLetter enabled the SendGrid module by default. Since I did not use this service anymore (and no valid API was given), mails could not be sent.
After unchecking the "Enabled?" checkbox, mails are sent again.
THIS IS NOT FUNNY!

[johanmorris]

I have exactly the same problem (with a weekly Feed-by-Mail since october 2. Was there an automated update of NewsLetter then? I have it on 2 different websites, both on a different server. The mails are sent but are no longer delivered. Sending a normal testmail still works, sending a testmail from the "status" page gives a red KO. The link to https://www.thenewsletterplugin.com/test-newsletters-are-not-sent-test-emails-are gives me no solution; my provider swears there was no new mailfilter installed since then.
HELP !

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